/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2019-present Axmol Engine contributors (see AUTHORS.md).

 https://axmol.dev/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/

#pragma once

#include "axmol/base/Object.h"
#include "axmol/base/Vector.h"
#include "axmol/ui/GUIExport.h"

/**
 * @addtogroup ui
 * @{
 */
namespace ax
{

namespace ui
{

class LayoutProtocol;
class Widget;
class RelativeLayoutParameter;

/**
 *@brief Base class for managing layout.
 * All the concrete layout manager should inherit from this class.
 */
class AX_GUI_DLL LayoutManager : public Object
{
public:
    virtual ~LayoutManager() {}
    LayoutManager() {}

    /**
     * The interface does the actual layout work.
     */
    virtual void doLayout(LayoutProtocol* layout) = 0;

    friend class Layout;
};

/**
 *@brief Linear vertical layout class.
 * Note: This class is used only by @see `Layout` class.
 * @lua NA
 */
class AX_GUI_DLL LinearVerticalLayoutManager : public LayoutManager
{
private:
    LinearVerticalLayoutManager() {}
    virtual ~LinearVerticalLayoutManager() {}
    static LinearVerticalLayoutManager* create();
    void doLayout(LayoutProtocol* layout) override;

    friend class Layout;
};

/**
 *@brief Linear horizontal layout class.
 *Note: This class is used only by @see `Layout` class.
 * @lua NA
 */
class AX_GUI_DLL LinearHorizontalLayoutManager : public LayoutManager
{
private:
    LinearHorizontalLayoutManager() {}
    virtual ~LinearHorizontalLayoutManager() {}
    static LinearHorizontalLayoutManager* create();
    void doLayout(LayoutProtocol* layout) override;

    friend class Layout;
};

/**
 *@brief Linear vertical layout class.
 * Note: This class is used only by @see `Layout` class.
 * @lua NA
 */
class AX_GUI_DLL LinearCenterVerticalLayoutManager : public LayoutManager
{
private:
    LinearCenterVerticalLayoutManager() {}
    virtual ~LinearCenterVerticalLayoutManager() {}
    static LinearCenterVerticalLayoutManager* create();
    void doLayout(LayoutProtocol* layout) override;

    friend class Layout;
};

/**
 *@brief Linear horizontal layout class.
 * Note: This class is used only by @see `Layout` class.
 * @lua NA
 */
class AX_GUI_DLL LinearCenterHorizontalLayoutManager : public LayoutManager
{
private:
    LinearCenterHorizontalLayoutManager() {}
    virtual ~LinearCenterHorizontalLayoutManager() {}
    static LinearCenterHorizontalLayoutManager* create();
    void doLayout(LayoutProtocol* layout) override;

    friend class Layout;
};

/**
 *@brief Relative layout class.
 *Note: This class is used only by `Layout` class.
 * @lua NA
 */
class AX_GUI_DLL RelativeLayoutManager : public LayoutManager
{
private:
    RelativeLayoutManager()
        : _unlayoutChildCount(0)
        , _widget(nullptr)
        , _finalPositionX(0.0f)
        , _finalPositionY(0.0f)
        , _relativeWidgetLP(nullptr)
    {}
    virtual ~RelativeLayoutManager() {}
    static RelativeLayoutManager* create();
    void doLayout(LayoutProtocol* layout) override;

    Vector<Widget*> getAllWidgets(LayoutProtocol* layout);
    Widget* getRelativeWidget(Widget* widget);
    bool calculateFinalPositionWithRelativeWidget(LayoutProtocol* layout);
    void calculateFinalPositionWithRelativeAlign();

    ssize_t _unlayoutChildCount;
    Vector<Widget*> _widgetChildren;
    Widget* _widget;
    float _finalPositionX;
    float _finalPositionY;

    RelativeLayoutParameter* _relativeWidgetLP;

    friend class Layout;
};

}  // namespace ui

}  // namespace ax
// end of ui group
/// @}
